成入院外获得性肺炎最常见的病原菌是()
A.肺炎球菌
B.流感嗜血杆菌
C.嗜肺军团菌
D.肺炎支原体
E.铜绿假单胞菌
参考答案:A
Dictionaries are important to us students. When we meet a new word, we can _____ in them.[ ]
A. look it up
B. look up it
C. look for it
D. look them up
表示设备断开和允许进入间隔的信号、经常接入的电压表等,如果指示有电,则禁止在设备上工作。